Improved machine fob keying glue



` with the glue thereon, fora long period; that is to say,

@uiten gioire sttrnt @Hirn Letters Patent No. 80,250, dated -July 21, 1868.

IMPROVD MACHINE FOR DRYING GLUB.-

@te Stimuli :remt tu in tiges: rttrr Emmi mit uiting tutti tige samt.

TO ALL 4WHOM I'l MAY' CONCERN:

Be it known that I, CHRISTIAN WAHL, of Chicago, in the State of Illinois, have invented certainnewand useful Improvements in Machines for Drying Glue; and I do hereby declare that the following is a full and exact description thereof. i

My invention produces the inished glue in thin iiakes of the best quality by a continuous operation, which may be effected very rapidly, and with little labor. Some'portions of my apparatus have been before patented, but the features have not, so far as I am aware, been before combined, and several features of` importance I believe to be entirely new. i i i I will first describe what I consider the best means of carrying out my invention, and willafterwardsdesig pate the points which I believe to be new therein. 'i Figure 1 is a side elevation of the entire apparatus with the side removed, to give a goodvieiv ofthe interior. Figure 2 is a cross-section on the line s s in iig. 1. l Y

:Figure 3 represents some ofthe details on a large scale. Fignrefl represents a modification ofthe same, which is on some acccunts preferable. Similar lettersof reference indicate corresponding parts in all the-figures. p A is a large wheel, slowly turned by means of a steam-engine, or other suitable power, not represented. 0n this wheel is carri-cda series of platos, B. The glue is drie., in. e.` thin coat on these` plates, and cracks and comes oi as the' operation of drying becomes complete. The plates material which presents an enamelled or polished surface.

D` is the trough or vessel which contains the glue in a liquid condition. V

The glue is maintained at a proper temperature therein by means of stcam-pipes, or other approved means. Tho plates B, after being wet in the glue, m, are carried slowly around on the wheel, exposed to currentsjof'air, which facilitate the drying. The air comes-fromtwo sources, and is very di'ercnt in its condition and function.,

ev isal fan, wl'ch drives cold air through the passage@` into contact with the plates B so soon as 'they emerge from the glue. Inisair being cold,l chills the glue, and permits its setting in a uniform coating or thickness. This air escapesV through the passage without being carried in contact with the plates any great length of time. The fan h receives and blows into the apparatus, through the ilue H, air which is either warmed or chemically dried, or both, in order to increase its drying effect This air circulates in contact with the plates B, it rises onemerging from theueILand traverses more than half thp entire circumference of the wheel A. It finally escapes through the flue G. Y y

By this arrangement, the glue is exposed for a very short time to ordinary coldair until it is chilled. d It is th'en exposed to air which is specially prepared to 'increase its drying effectV for a large proportion of its rev.- olutions. i l i The air, in escaping through the passage G, is liable to carry `some oi' the {lal'iy'gl'uefwith it. The chamber J is provided to receive this glue, and the air, after depositing the flaky glue, escapes through wire gauze,` or other iinely-perforatcd medium, in the upper portion ofthe chamber J.

The plates B may be 'made in various forms, and arranged in various manners. I prefer to -mount them in the form of disks, in series, on the shaft Z, and to rotate. them on their axes b while they areat the same' aime carried on the large wheel A; but this is not absolutely essential.`

Figures 1 A 1 B represent modifications, which may bc adopted if preferred.

Many other modifications may be made by any good mechanic without completely' defeating the object of my invention, it being'understood that the provisions for brushing off the glue, now to be described, should be very materially modified iu case the other modiiicatiousof the drying-plates are adopted.A

B is a toothed wheel or pulley, much smaller in diameter than the disks B, and fixed on cach shaft b. I

esteem it well to rotate the shaft b and the parts carried thereon slowly through the entire journey, which may which may be continued quite around, or ,interbc eiccted by causing the wheel B to traverse in fixed racks,

B are preferably of enamelled iron, or some deflections orpartial partitions Tmay be rigid.

so,.so 2

sporsed at intervals; but VI esteem it especially important that the rotation shall be active at two points. One of these points is while the plates are receiving the glue in the tank D, and the other is while they are being brushed by the rotating brush `or rubber R.

It will ybe understood that the rubber Il, which is preferably a brush, is madein disks,corre'sponding to the disks B, and matching between them, and that in rotating it rubs the disks and removes any 'of the flakes of glue which might tend to adhere to the plates. New, by rotating the plates actively, while subjected `to the action ofthe brush, I insure that all parts of Athe disks-shall be treated by the rbber or brush, and ordinarily two or three times.

I eiect this by causingthe gearfwhcel or pulley'B-l to come in contact at those points with corresponding gear-wheels or pulleys, N, which are rotated actively by the steam-engine or other motive-power which impels the apparatus. The action will now he readily understood. The plates B receive the glue in a liquid form uniformly, the gluer is chilled thereon as soon as practicable afterwards, as soon as it is lifted from the tank D, then it is subsequently exposed for a long period to dry air, and turned slowly, either constantly or at intervals; but when it reaches the brush R, it is rotated very actively while it is being treated by the brush, and when it reaches thc tank D it -isagain rotated. L Y

. It should not in this last instance rotate very-rapidly, sc as to seriously disturb the liquid, and' cause it-to splash upon any of the adjacent parts. It maybe rotated when in contact with the brush as actively as the judgment or fancy of the constructor may prefer. By rotating theplates two or more times in the glue, chilling the same each time it is lifted, I get ajust suiiiciently thick and.V uniform coating of glue on the-plates.

This adding the' glue by successive coats, like dipping a candle in tallow, is especially important with some grades of glue. The greater contraction of a thick coating in drying facilitates its clearance from the plates I attach much importance to this repeated operation oi" dipping thc plates into the glue, and chilling the same after each immersion, asin this manner I am able to obtain any desired thickness of the glue, and it is much y easier to re'move'a comparatively heavier coating of glue from the 'platesthan the very thinnest coatings, which are liable to cling to them.

It will be understood that a portion of the glue which is not blown out through the passa-ge G is carried over with thewheel A, and dropped on the other side ofthe apparatus in n *suitable chamber, L, as represented. I employ rneans for transferring over all the flakes of glue which fall oi the plates'B at or 'near theupper part of the circumference of'thc wheel. These-ineens are the partial partitions T, which are arranged, as repre,- sented, between the series of disksB, and project out'to a moderate extent, as represented. They perform two functions, one, the collecting and transferring over of the glue, as above intimated, the other, that of deecting the current of air, which might otherwise tend to move-around without proper circulation; that is to say, they stop'or dam up the clear space which would otherwise be provided quite around next to the wheel A. These I employ, in' combination with the latter, andwith all tlie other-parts of'the apparatus, another series of dclectors, which should be.c\iblc, because they may and by preference should ex'ten'd out so far as to touch the plates B. These arere'prescnted by F, and are fixed soy as to extend linward from thecasing Y, which surrounds the wheel A, and which forms the channel in which the dryingair is conducted around. These have the eiicct to disturb and circulate the air, and to prevent its. flowing too rapidly along the clear space outside of the plates B. By reasoxi'bf the combination of lboth series of deilectors, F and T, with` the other parts of my apparatus, I am enabled to insure a very cflicientirculation of the currents" of air.

Fig. 4 represents a modification oi the provision for turning the -plates B actively. This consists in the Y'substitution of two pulleys, and a short elastic belt of pure vulcanized rubber, or 4analogous material, in place of the single pulley or gear-wheel N, abov'e described. This allows the active rotation to becontinued for a. longer period than would otherwise be practicable, supposing the wheel'A and its connections to be turned continuously, which is on sonic accounts preferable:- But I can dispense with `this device, iig'. 4, and still turn the plates actively. for any length of time desired, by arrestingv the motion of the' wheel A and its `connections ai. proper periods, so ns to hold each series of plates B for a considerable period in-contact with the impelling-- means. l l

Figure l? represents plates extending around the wheel A, either continuously or intermittently. These may `be brushed as above provided.

Figure I" represents plates extending lengthwise ofthe wheel. These should he brushed by a special provision traversing lengthwise, as will bc obvious, or the brushing may probably be dispensed with without entirely defeating the success ofthe apparatus.l l

Apparatus for pouring or squirt-ing the liquid glue upon the surfaces B may he substituted for the tank D, if preferred.

Having vnow fully described my invention, what I claim as n ew, and desire to Asecure byLetters Patent,

1. I claim 'the within-described combination and arrangement of the passages in a 'glue-drying. apparatus, so that tho glue-drying surfaces shall be` presented to the warm or chemicallyfdried air for a longer period than to the cold air, for the purposes herein set forth.

2.' I claim revolving the disks 33or their equivalents, two or more times when the glue is being received thereon, and chilling the glue at eachrevolution, substantially as and forthe purposes herein set forth. v

3. I claim actively revolving the disks B, by means of the pulleys N, or their equivalents, at the period when the glue is being removed, as herein specified. v

4. I claim the partial partitions T,'arranged as representcd,4and adapted to serve the double purposes o deiiectiug the `air-currents and retaining thc glue, substantially as herein set forth.

amm 8 5. I claim the combination of the partial partitions F and T, nrrangedns represented'relatively -to each other and to the glue-exposing surfaoes B, and tothe currents 'of air traversing the some, substantially in the manner and for th'o purposes herein specified. I

6. I claim the combination of the revolving disks B with the wheel A, for transporting thenn through drying Currents of air,substantia.l1y as and for the' purposes herein set forth.

In testimony whereof, I have hereunto set my name in presence of two snbsoribing witnesses. CHRISTIAN WAHL.

- lWitnesses:

C. C. Lrvmos, W. C. Dnr. 

